As noted by others, you will receive many different recommendations for pieces of software. IIWY, I'd ask the following questions
a) how easy/reliable is performing a *restore*? not how easy is it to perform the backup. This ancient website was originally setup as a marketing tool for a product that (I believe) no longer exists. <http://www.taobackup.com/> However, it lists seven core principles of backups (in a light hearted and amusing way) that you should compare any backup solution against. From my experience, I would discount anything which relies on hard link trees. That means a lot of rsync-based solutions, including rsnapshot. Apart from not being a 1:1 backup (you lose hard links!), the filesystem metadata storage explodes for any reasonable sized filesystem and any reasonable frequency of backup. I currently use rdiff-snapshot. I personally think there is still a lot of space for new solutions (yet to see a good git-based one) -- Jon Dowland
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