Zip File Size Limit (4GB)

GoogleCodeExporter commented 9 years ago

Is there a "file size" or "number of files" limitation on this software?
I have tried to backup my photo files twice with the same error...see
below.  File size is about 7.163GB

WinRAR Error:
!   C:\Backup\My Photos_2009-01-03.zip: Unexpected end of archive

Windows error:
The compressed (zipped) folder is invalid or corrupt.

Submitted by Larry.

Original issue reported on code.google.com by pilaftank on 4 Jan 2009 at 8:49

GoogleCodeExporter commented 9 years ago

There is no hard limit to the number or size of files Snap Backup can handle.  
That
being said, Snap Backup has not been rigorously tested on large file sets.  My 
guess
is that the number of files is probably not an issue (I've done backups with 
lots of
smaller files).  The issue is probably with the overall size of the resulting 
backup
file.  I believe the zip format originally did not support files larger than 
2GB.  I
think the limit is now 4GB, but it should be extended soon.

More Info:
  http://en.wikipedia.org/wiki/ZIP_file_format#Technical_information
  http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4681995

Workaround:
Use the profiles feature (File --> Multiple Profiles --> On) in Snap Backup to 
define
multiple backups enabling you to break your zip file into two or three smaller 
zip files.

Original comment by pilaftank on 4 Jan 2009 at 8:52

Changed state: Accepted

GoogleCodeExporter commented 9 years ago

What are the size limitations to the backup files?  I've tried saving Outlook 
PST files, (2GB), and also larger 
database files (20GB).  The database files always complete with a small 
fraction of the size (20 > 3GB) but when I 
try to open the ZIP file to confirm the data, it opens empty.

Submitted by Matt.

Original comment by pilaftank on 13 Mar 2009 at 4:35

GoogleCodeExporter commented 9 years ago

A warning message is now displayed if the zip file is larger than 3.8 MB (allow 
for 0.2 MB margin of error).

The new Zip64 format gets around the 4 GB limitation.  Java 7 (release date 
early 2010?) is slated to support 
Zip64.

Original comment by pilaftank on 4 Aug 2009 at 11:20

edenkyira / snapbackup

Zip File Size Limit (4GB) #8