DOn't worry about the amount of data from hourly backups. If nothing is changed on the system then there is no data written to the backup device. Only data that has changed relative to the last backup interval is written. In an office files server this could be quite a lot of data 9 to5but zero change at night. On a tiny system mostly nothing changes.
Also it does not matter how long the system has been running continuously, what matters is how fast the data changes. Most all backup system will delete older version if the backup disk is full so the backup remains always the size of the disk. So for example as the disk fills with hourly copies of some log file the system finds the oldest logs and keeps only daily snapshots, then as the disk files it keeps only weekly then monthly and yearly copies. So after this runs a while you find you have hourly resolution only back to a point and then it goes to weekly or monthly. The details depend on the size of the backup disk. But almost always the system can be configured to only a specified amount of space. As a rule of thumb your backup disk is 2X the size of the data tube backup up. This works because most files never change. This is the system Apple uses on Mac OS. Macs run BSD UNIX and there are some Linux/Unix copies of Apple's system that you can download and install. All of them do a good job of managing a fixed amount of backup space. It is hard to say what is best. Perhaps you have a half dozen Linux systems and some Windows PC notebooks and you want to centralize backup to one server? The server then has to know how to talk to both Windows and Linux clients. But other people have just one PC and have simpler needs. So there is no "best" backup system. And then do you only have a few text files you care about or do you have digital photos and video footage that add up to multiple terabytes or more? Video cameras fill disks quickly. then the backup device needs to be a RAID. Here are some links https://www.ubuntupit.com/top-15-free-open-source-backup-software-for-linux/ Google can find more. Some of the above can integrate the cloud storage services like Backblaze or Amazon S3 Then you are 100% bomb proof, literally. You keep a local versions backup and also a copy of the same off-site. On Tue, Jan 15, 2019 at 8:01 AM Jon Elson <[email protected]> wrote: > On 01/14/2019 09:31 PM, Chris Albertson wrote: > > The blu rays work but the backup internal is to long. It really needs > to > > be done every hour. Hourly backup is best done with a hard drive. > HOUR? Well, really, my Linux systems stay up a log time. I > just rebooted my main desktop system after 540 days > continuous running. My Asterisk phone system recently > crashed and I had to do a manual fsck after about 15 months > running. My main server (router/firewall, web, mail, ssh, > dns, etc.) has been up 317 days. > > A simple and painless way is to subscribe to a service. The guys who run > > the the big cloud can buy storage cheaper then you can and they have > > peta-bytes and do all the maintenance and upgrades for you. > I don't trust these cloud services. I had a cheap (but not > free) secondary name server that went out of business with > no warning or anything. I'd just done a 2-year renewal. > Just one day their service stopped working. > > One problem with using small media is that to restore it you have to > know a > > lot. Typically each disc is only the delta from a full snapshot so to > > restore you first restore the last ful image then you have to restore > each > > change disc. > > > > > True on my hard drive backup, NOT true on the blu-ray > backup. Every one is a full backup. > One of the problems with the incremental backup is if one of > the deltas is seriously bad, like completely unreadable, you > have a major mess to reconstruct what you can. And, if the > last update to a file was on the bad delta, it is just gone, > you only have the oldest version on the full backup. > > I don't consider a blu-ray as "small media". It is > 22-something GB. It will hold pretty much all of my main > user file tree. > I have my pictures and various CNC manuals in another file > tree, and back that up to another blu-ray. > > Jon > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
