BackupPC 4.0 has been released but there major changes that prevent a seamless upgrade and some new dependencies that are not in Fedora.

With version 4.0 hard links are no longer used for deduplication and instead attribute files are stored in each directory.

While 4.0 is backwards compatible with 3.X backups there are some client side configuration changes that may cause problems.

Additionally there are two new requirements:

rsync-bpc - A fork of rsync to speed up the previous perl based version in 3.X that has added capabilities needed for BackupPC

https://bugzilla.redhat.com/show_bug.cgi?id=1432104

BackupPC-XS - Several BackupPC functions in a perl module

https://bugzilla.redhat.com/show_bug.cgi?id=1432122

My plan is to get both of these packages in f26 and rawhide and upgrade both branches to 4.0. 

If there is enough demand I may also create a BackupPC-4 package for F25 and EPEL 6 & 7 so those that want to upgrade can choose to do so.

Thanks,
Richard