Thanks for your contribution. A fix solving the bug is already committed
and will be released within this month. With the fix applied, there is
no longer a need to force the backup (or to incorporate an option to do
so). Let my explain how it  works:

* in the case of full backups the required uncompressed space is computed and 
the backup is done only if enough disk space is available.
* if an incremental backup is created the required uncompressed space of the 
files actually being backed up is computed. The backup is aborted if not enough 
disk space is available.

Simple and consistent.

Some words about an additional option: It is, IMO, not a good idea to
force a backup if not enough disk space is available. Such option would
be dangerous for the most of the users. Moreover, if you know you have
only little disk space available you can check your space before doing a
manual backup. I think this is similar to an additional action triggered
by such option. So,  frankly speaking I believe If someone would use
this option he knows that there is only little disk space and should
check it manually instead.

To the autoremove thing: there is already such feature - the purging of
old snapshots. Introducing another autoremove is dangerous again since I
usually want to keep some old snapshots instead of remove them.
Moreover, it is hard to decide for software (meaning to implement)  what
snapshots should be removed and what to keep. And disk space is getting
cheaper and cheaper.

I aggree that a useful feature would be the fallback to an incremental
backup if there is not enough space for a full backup. However, this
requires an existing and  valid snapshot as parent/base.

Hope this helps,
Jean-Peer

-- 
Incremental backups fail due to available space prediction
https://bugs.launchpad.net/bugs/503597
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