Backups using differential and full and causing issues

i sharepoint administrator using sharepoint 2010 sp1 enteprise edition , running powershell backup nightly full farm backup.

backup-spfarm -directory \\serversqlbackup01\sql_full_backups\sharepoint\spbackup\production-farm -backupmethod full -verbose

i run backup's in sharepoint's central administration nightly perform full database crawl , incremental crawl every half hour on sharepoint farm.

my dba finding these backup's , causing him wonder going on not doing differntial , states happen simple database mode, not full.

it happened on simple model databases

this export sql management studio 2012 sp1 bi edition

databasename          recovery_model         user_name      duration in mins       backup_start_date            backup_finish_date   backuptype     backup_size    size_unit         physical_device_name            backup_set_id
search_service_application_server1_crawlstoredb_c9d7342c169a4b75a6254c0b6871f44e     simple            domain\farm-account  0.016666         2013-05-29 23:16:06.000        2013-05-29 23:16:07.000            differential     1.273437500000000   mb            \\serversqlbackup01\sql_full_backups\sharepoint\spbackup\production-farm\spbr00b5\00000134.bak            29638
search_service_application_server1_crawlstoredb_c9d7342c169a4b75a6254c0b6871f44e     simple            domain\farm-account  0.283333         2013-05-29 23:14:12.000        2013-05-29 23:14:29.000        full            451.274414062000000           mb            \\serversqlbackup01\sql_full_backups\sharepoint\spbackup\production-farm\spbr00b5\00000134.bak            29635

here concern,
backup history sql server database indicates backups getting appended existing backup devices. increases risk of losing backups when backup device gets damaged. performance of backup , restore operations might degraded when several backups appended 1 on same backup device resides on remote server , accessed on network

thank you!

upon looking @ this, location, starting "serversqlbackup01" is using backup's sharepoint creating , referencing setting in powershell script.  why sql management studio reading / referencing / getting errors this?

here concern,
backup history sql server database indicates backups getting appended existing backup devices. increases risk of losing backups when backup device gets damaged. performance of backup , restore operations might degraded when several backups appended 1 on same backup device resides on remote server , accessed on network

hi ,

i hope taking backups on tape drive ..its highly unlikely tape set corrupt...and apending backups set default during backup

appending lets u manage ur backup set through 1 tape..its easier transfer it..

if taking on local disk think not practice

for pros , con on appending backup u can read tbelow

http://www.sqlservercentral.com/forums/topic796873-146-1.aspx

http://msdn.microsoft.com/en-us/library/ms191505(v=sql.105).aspx

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