Within a very important VirtualBox, which was at the time approximately 400 Gigabytes, Time Machine is not backing many files inside this machine, for even several months, despite them being changed every day. This includes an SQL database and other critical files. I assume, rather unfortunately, there is some kind of buffer space in the VB, and Time Machine is only operating on the basis of the file size of the entire .vdi file--does anyone know a workaround?
This system runs on a RAID0 array, if that is any factor.
Of course, to the praise of Time Machine, by its nature it has limited settings, and I've read completely the opposite in many places that even with minor changes based on the time-stamp it makes too many backups for many people's tastes; not the case here. Any tips are appreciated.
The host is OSX 10.10, and the virtual client-OS is Ubuntu 14.10 LTS; time machine is set with default settings to backup all files in a single folder within the user home, into a RAID1 external drive connected via thunderbolt.
When you try and test the backup, the files in the guest operating system are much newer than what has been backed-up.