public bool DoBackup(ref bool outputToXmlRequired)
{
VolumeSnapshot currentSnapshot = null;
bool backupSuccess = false;
bool noChangesRequired = false;
outputToXmlRequired = false;
mCancelledByUser = false;
try
{
mBusy = true;
FileSync.__Log(this, "Building standing on disk snapshot...");
// Take a snapshot of the volume as it stands on disk
currentSnapshot = VolumeSnapshot.BuildFromSource(mSource);
if (!currentSnapshot.Empty)
{
FileSync.__Log(this, "Snapshot built, " + currentSnapshot.FileCount + " files found");
VolumeSnapshotRevision mostRecentRevision = mDatabase.GetMostRecentRevision();
// Compare to previous snapshot
if (mostRecentRevision != null)
{
FileSync.__Log(this, "Starting incremental backup, " + mDatabase.GetRevisionHistory().Count
+ " revisions existing [Most recent: " + mostRecentRevision.ToString() + "]");
// Only do an incremental backup to backup whats changed since last full snapshot
VolumeSnapshot mostRecentSnapshot = mDatabase.LoadSnapshotRevision(mSource, mostRecentRevision);
backupSuccess = mBackupOperation.DoIncrementalBackup(currentSnapshot, mostRecentSnapshot, mSource, mArchive, out noChangesRequired);
FileSync.__Log(this, "Incremental backup " + (backupSuccess ? "completed successfully" : "failed")
+ " " + (noChangesRequired ? "no changes required" : "changes detected"));
}
else
{
FileSync.__Log(this, "Starting full initial backup");
// Brand new volume backup, do a full backup of the volume
backupSuccess = mBackupOperation.DoFullBackup(currentSnapshot, mSource, mArchive);
FileSync.__Log(this, "Full backup " + (backupSuccess ? "completed successfully" : "failed"));
}
if (backupSuccess)
{
if (!noChangesRequired)
{
FileSync.__Log(this, "Saving snapshot revision file [" + currentSnapshot.Revision.ToString() + "]");
mDatabase.SaveSnapshotRevision(currentSnapshot);
outputToXmlRequired = true;
FileSync.__Log(this, "Snapshot file saved");
}
else
{
FileSync.__Log(this, "No changes required, not saving revision [" + currentSnapshot.Revision.ToString() + "]");
}
}
else
{
FileSync.__Log(this, "Backup failed, deleting temporary files for revision [" + currentSnapshot.Revision.ToString() + "]");
mDatabase.DeleteSnapshotRevision(currentSnapshot.Revision); // remove half-copied data
mArchive.DeleteRevision(currentSnapshot.Revision);
outputToXmlRequired = true;
}
}
else
{
FileSync.__Log(this, "Built snapshot is empty, aborting backup");
}
}
catch (Exception e)
{
backupSuccess = false;
FileSync.__LogError(this, "BackupRestoreVolume.DoBackup", e);
if (currentSnapshot != null)
{
FileSync.__Log(this, "Backup failed due to exception caught, deleting temporary files for revision [" + currentSnapshot.Revision.ToString() + "]");
mDatabase.DeleteSnapshotRevision(currentSnapshot.Revision); // remove half-copied data
mArchive.DeleteRevision(currentSnapshot.Revision);
}
outputToXmlRequired = true;
}
finally
{
mBusy = false;
}
return(backupSuccess);
}
