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README: clarify what "resuming backups" means #467

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README: clarify what "resuming backups" means #467

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14 changes: 13 additions & 1 deletion README.md
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Expand Up @@ -18,7 +18,8 @@ Key Features:
* Flexible retention policy
* Backups to multiple destinations
* Transfer via ssh
* Resume backups (for removable and mobile devices)
* Robust recovery from interrupted backups (for removable and mobile
devices, also see note below)
* Archive to offline storage
* Encrypted backups to non-btrfs storage
* Wildcard subvolumes (useful for docker and lxc containers)
Expand All @@ -32,6 +33,17 @@ Btrbk is designed to run as a cron job for triggering periodic
snapshots and backups, as well as from the command line (e.g. for
instantly creating additional snapshots).

Note that when btrbk is interrupted during the backup of snapshots
to/from a remote host, it is able to recover from it and will only
transfer the outstanding snapshots that failed to transfer successfully
in the previous interrupted run. However, individual snapshot transfers
will have to be restarted from the beginning, since resuming an
interrupted send/receive process is currently not possible in btrfs.
Therefore, btrbk might not be the best solution for scenarios where
large amounts of data (either the initial snapshot or big changes
between snapshots) have to be send over an unstable connection (e.g. bad
wireless connectivity).


Installation
============
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