ioSafe R4 - Manual (Page 45)

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You can also specify how long a snapshot should last. If you will be using snapshots for backups,
you can schedule the snapshot to last slightly longer than the expected duration of the backup.
Having an active snapshot can affect the write performance to the ioSafe R4, so deactivating it when
not needed may be advantageous in write-intensive environments.
When a snapshot is taken, snapshots of shares appear in your browse list alongside the original
shares, except the snapshot share names have –snap appended to the original share names. For
example, a snapshot taken of share backup will be available as backup-snap.