Archiving the Archives

Hello,

My Acronis True Image Home 2010 has been working steadily since last October. The destination drive has become full, and I would like to free up disk space.

Is it feasible to off-load the earlier backup files? Should I delete backups more than X months old? Should I leave the current backup drive in tact and just purchase a new drive?

What approaches have other users developed to handle this situation?

Thanks.