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Forum Discussion
Storage
My ReadyNAS 104s have a 3 x 1Tb RAID5 array in them ( I have two)
I am using Cobian Backup to do incremental backups from my server drives. After the first backups, the amount of storage used on each volume matched the shared folders on the server ( ie 52 and 201Gb each). After three days of backup, my RN104s are showing that half of the 2Tb volume ( well 820 Gb anyway ) is now used. I have been through the backups and they reflect the server shares exactly. I can't see where this 'extra' space is being used. Is it the snapshots? I thought that these only took up very small amounts of space - hence the potential 4 weeks recovery on daily backups.
Anyone any ideas?
I am using Cobian Backup to do incremental backups from my server drives. After the first backups, the amount of storage used on each volume matched the shared folders on the server ( ie 52 and 201Gb each). After three days of backup, my RN104s are showing that half of the 2Tb volume ( well 820 Gb anyway ) is now used. I have been through the backups and they reflect the server shares exactly. I can't see where this 'extra' space is being used. Is it the snapshots? I thought that these only took up very small amounts of space - hence the potential 4 weeks recovery on daily backups.
Anyone any ideas?
3 Replies
- I think it is the snapshots.
There is no magic on the size they take. The principle is "copy on write" When you replace data by rewriting (or deleting) the old version is placed in the snapshot.
Files that haven't changed take no space - but the ones that have changed can take a lot of space. - Thanks Stephen. I think I'm going to download the older version 10 of Cobian anyway and use the timestamps. I can't believe that 160 Gb of 210Gb storage needs doing everyday on incremental and yet that is what Cobian is backing up. Never had this with the old version.
Re the ReadyNAS. The remaining storage shouldn't be a problem then as the ReadyNAS will delete older snapshots, once only 5% of disk space is left, to make way for the backups, correct?
Cheers
It is designed to maintain at 5% or more free space. Also, hourly, daily snapshots are pruned on a schedule.STAXUser wrote: ...the ReadyNAS will delete older snapshots, once only 5% of disk space is left, to make way for the backups, correct?
Though if you use the web interface, and select "recover' for the share, you can see the snapshots and delete them. I am thinking that you probably don't need snapshots on the Cobian backups.
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