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external drive is full so now what do i do?

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ok i have a partitions backup and i do a weekly full file backup too to an external hard external hard drive and the drive is full. so what do i do now. i don't understand way the file back up is so large, its 1.66tb. shouldn't since i have a full partition backup made and validated , cant i just do a incremental back up weekly of what files change or that are added? wont that keep the backup file size very small. so can somebody help me out. either way what can i do now. on this external i have my partitions back up made and my data back up done weekly and the weekly back up looks like its a full file back up and not a incremental. so what are my options here.

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If the disk is full, then you will need to use the TI program delete function and remove some excess.
http://forum.acronis.com/system/files/delete-backup-file.jpg
The removal of these files can be a tricky business if you wish to retain some. Any of the full backups can be retained and "perhaps" others but depending upon their type, etc.

You will need to start over with new backup tasks pointing to a new empty folder on your storage disk.
Editing or changing the configuration of an existing task is not recommend as the results of editing is rarely ever what is expected so my recommendation is start over with new tasks.

Before you start over, spend some reading time on link 2 below, particularly links 11-Full; and 11-Inc and 11-Diff. Each of these types enables you to utilize the program to start fresh and have the program do automatic cleanup (autodeletion) of the older backup as the newer one comes on to replace them.

Depending upon what you wish to accomplish, you may be able to use just one backup task; otherwise, use two to accomplish both a disk mode backup plus a files only backup.

Acronis tracks uses disk sectors so whenever there are changes (such as disk defrag), all the changes of sectors gets included in the next backup so a defrag will increase the backup size dramatically and make an incremental look like a full. Also, if the disk has bad sectors, this too can cause size enlargement. If doing file backup type, a change of a single file could cause the entire disk sector to be included so it is hard for me to advise the cause of the large backup size. Do be careful in the selection of what is to be included if using a files only backup.

This link may also be of interest.

http://forum.acronis.com/forum/38799#comment-122496