Hi Allan, With a network drive, Time Machine doesn’t just copy files to the drive itself, but rather to a sparseimage, which is a kind of disk image that is expandable.
The Time Capsule /Time Machine usually run verification automatically, once a month. You can also run it manually, by holding the Alt/Option key while selecting the Time Machine icon in your Menubar and selecting Verify Backups. If you double-click the sparsebundle you get a ‘Time Machine Backups’ volume and if you double-click that you get the ‘Backups.backupdb’ folder. Cheers, Ronni Ronni Brown’s iPad Pro 12.9-inch 256GB > On 4 May 2018, at 11:46 am, Alan Smith <sma...@iinet.net.au> wrote: > > Thread re-opened to add a new learning - - > > Time Machine only does “verification” of data on a network drive (such as > Time Capsule). I assume this means sparse bundle backups. > > TM backups on local drives (internal or external) have the manual "verify > now” option greyed out. I assume this is the backups.backupdb file format. > > Alan > >> On 2 May 2018, at 10:32 am, Alan Smith <sma...@iinet.net.au> wrote: >> >> To close off this thread and create a log as a memory tickler for next time >> - -. >> >> TM Sparse bundle version: After failed verification all history is lost and >> a new backup created. If the history is valuable then editing of the sparse >> bundle may be warranted. I understand it is possible but it is not simple. >> I didn’t save the corrupted file. >> >> TM Backups.backupdb version: Data looks as if it could be easily edited to >> remove single or multiple days. I did not investigate the process for doing >> this. >> >> Alan >> >> >>> On 29 Apr 2018, at 11:12 pm, Alan Smith <sma...@iinet.net.au> wrote: >>> >>> I run duplicate Time Machine backups, one to a local drive and the other >>> (sparse bundle format) to the Time capsule network drive. I got a screen >>> notification to the effect that verification had failed and TM needed to >>> create a new backup. I clicked on the “tell me again tomorrow” button. It >>> seems that verification happens when the daily, weekly and monthly >>> consolidation is done. >>> >>> Do I lose the complete backup history by accepting the notification >>> tomorrow? Can I manually delete the backup data between 26-29 April (or >>> the combined weekly or monthly file) and retain earlier history? While TM >>> was “off” for most of those days, some backups were created during my >>> repair and restoration (ongoing!) work in readiness for installing High >>> Sierra. If all data is lost then it would be more convenient to manually >>> delete the sparse bundle and create a brand new backup when I have time. >>> It’s not worth the effort to try repairing the sparse bundle. >>> >>> I haven’t tempted fate by running a manual verification on the second TM >>> backup which creates backups.backupdb files. >>> >>> Cheers >>> Alan >>> iMac late 2009, OSX 10.9.5 Mavericks.
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